Wormsign

Original Dune
This article or section refers to elements from Original Dune.

Wormsign is a tell-tale signal which indicates that a sandworm was approaching. It usually manifested itself as static charges on the surface of sand dunes. When the sandworm reached a shallow depth, a surge in the sands appeared. The observation of wormsign usually meant that a sandworm's estimated time of arrival could be calculated by skilled watchers.